Thinking Mathematically (6th Edition)

by
Blitzer, Robert F.

Chapter 2 - Set Theory - 2.5 Survey Problems - Exercise Set 2.5: 20

Answer

The number of elements in set A and set C but not set B = 2.

Work Step by Step

From the given Venn diagram,
the regions IV represents to set A and set C but not set B.
It's given from the Venn diagram that:
The number of elements belongs to region IV = 2.
Therefore the number of elements in set A and set C but not set B = 2.